Pierogi-inspired lasagna

Pierogi-inspired lasagna was pinched from <a href="http://casserole.cooktopcove.com/2016/03/24/how-to-make-a-delicious-pierogi-inspired-lasagna/" target="_blank">casserole.cooktopcove.com.</a>
INGREDIENTS
5 onions, finely chopped
12 lasagna noodles, cooked according to package directions
1 stick (1/2 cup) butter
1/2 teaspoon salt
1/2 teaspoon black pepper
1 1/2 cups shredded Cheddar cheese
6 cups warm seasoned mashed potatoes, store-bought or homemade*
For homemade creamy mashed potatoes
10 medium-sized potatoes (about 4 lbs), peeled and quartered
1 cup whole milk
1 cup sour cream
1 stick (1/2 cup) butter
2 teaspoons salt
2 teaspoons pepper
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